Non-ionic detergent as a complexing agent in the determination of fluoride with the fluoride electrode

1983 ◽  
Vol 79 (1-2) ◽  
pp. 29-35 ◽  
Author(s):  
P. Pakalns
Keyword(s):  
Complexing Agent ◽  
Ionic Detergent ◽  
Fluoride Electrode

Optimization of an analytical method for the spectrophotometric determination of copper in tea and water samples after ultrasonic assisted cloud point extraction using a benzothiazole fluorescein derivative complexing agent

RSC Advances ◽  
2015 ◽  
Vol 5 (80) ◽  
pp. 65321-65327 ◽  
Author(s):  
Chunlei Fan ◽  
Shengxu Luo ◽  
Rong Liu
Keyword(s):  
Cloud Point ◽  
Spectrophotometric Determination ◽  
Water Samples ◽  
Analytical Method ◽  
Cloud Point Extraction ◽  
Complexing Agent ◽  
Ultrasonic Assisted ◽  
Determination Of Copper

BTF is exists with spirolactone species with adding Cu2+, which leads to the absorbance intensity is decreased gradually and the decrease of the absorbance value is linear for Cu2+.

scholarly journals With Solvent Extraction Method, and via new Organic Reagent 2-(Benzo thiazolyl azo)-4,5- Diphenyl Imidazole for Spectrophotometric Determination of Copper (II) in different Samples

2014 ◽  
Vol 11 (1) ◽  
pp. 147-157
Author(s):  
Baghdad Science Journal
Keyword(s):  
Organic Solvent ◽  
Spectrophotometric Determination ◽  
Extraction Method ◽  
Complex Structure ◽  
Organic Reagent ◽  
Complexing Agent ◽  
Solvent Extraction Method ◽  
Determination Of Copper ◽  
Synergism Effect

The new organic reagent 2-[Benzo thiazolyl azo]-4,5-diphenyl imidazole was prepared and used as complexing agent for separation and spectrophotometric determination of Cu2+ ion in some samples include plants, soil, water and human blood serum. Initially determined all factors effect on extraction method and the results show optimum pH was (pHex=9), optimum concentration was 40?g/5mLCu2+ and optimum shaking time was (15min.), as well stoichiometry study appears the complex structure was 1:1 Cu2+: BTADPI. Interferences effect of cations were studied. Synergism effect shows MIBK gave increasing in distribution ratio (D). Organic solvent effect appears there is no any linear relation between dielectric constant for organic solvent used and distribution ration (D). Thermodynamically found the reaction was Endothermic reaction, with ?Hex= 0.0131 KJ.mole-1,?Gex=-54.20 KJ.mole-1 ,?Sex= 167.84 J.mole-1.Beer’s law was obeyed over the concentration 1-30?g/5mL, and ?=922.90 Lmol-1.cm-1,with detection limit 1.7×10-5and Sandell’s sensitivity 6.8× 10-7 gcm-2.

Enzymic colorimetric determination of phosphatidylglycerol in amniotic fluid.

1984 ◽  
Vol 30 (4) ◽  
pp. 534-537 ◽  
Author(s):  
J D Artiss ◽  
M W McGowan ◽  
D R Strandbergh ◽  
E Epstein ◽  
B Zak
Keyword(s):  
Amniotic Fluid ◽  
Fetal Lung ◽  
Aqueous Sample ◽  
Colorimetric Determination ◽  
Glycerol Phosphate ◽  
Ionic Detergent ◽  
Catalyzed Reactions ◽  
Enzyme Catalyzed Reactions ◽  
Hydrolysis Of

Abstract We describe a procedure for the enzymic, colorimetric determination of phosphatidylglycerol in amniotic fluid. After extraction into chloroform:methanol (2:1 by vol) and evaporation, the phospholipid-containing residue is redissolved in a non-ionic detergent, which thus provides an aqueous sample. The subsequent enzymic reaction sequence involves phospholipase-catalyzed hydrolysis of glycerol from its phospholipid. Subsequent enzyme-catalyzed reactions phosphorylate this glycerol and oxidize the resulting glycerol phosphate to produce hydrogen peroxide, which is reacted to produce an intense red chromogen in the peroxidase-catalyzed coupling of 4-aminoantipyrine and 2-hydroxy-3,5-dichlorobenzenesulfonate. When used in conjunction with previously reported enzymic techniques for determination of lecithin and sphingomyelin, this procedure may provide an accurate and precise "lung profile" for assessment of fetal lung maturity.

scholarly journals Determination of Peroxide Value in Sunflower Halva using a Spectrophotometric Method

2010 ◽  
Vol 67 (2) ◽  
Author(s):  
Vlad MURESAN ◽  
Sevastita MUSTE ◽  
Emil RACOLTA ◽  
Cristina Anamaria SEMENIUC ◽  
Simona MAN ◽  
...  
Keyword(s):  
Peroxide Value ◽  
Room Temperature ◽  
Lipid Fraction ◽  
Ammonium Thiocyanate ◽  
Storage Conditions ◽  
Complexing Agent ◽  
Root Extract ◽  
Sunflower Seeds ◽  
The One

Sunflower halva, popular in countries from Eastern Europe, is made of sunflower tahini, cooked sugar and soapwort root extract. Lipid fraction in traditional sunflower halva is rich in polyunsaturated fatty acids, susceptible to peroxidation. Oxidation of the lipids is one of the main causes of lipid rich food deterioration leading to formation of off-flavour that negatively affect their quality and shelf life. In this study the initially phase of oxidation in sunflower halva was assessed, using as indicator the peroxide value (PV). The protocol followed was the one described by IDF standard which uses ammonium thiocyanate as Fe(III)-complexing agent. Halva samples stored at room temperature, in open air conditions for four months, respectively ten months were analyzed. The PV of sunflower halva at 10 months of storage was ~ 2 times higher that the PV of sunflower halva at 4 months of storage. The samples of sunflower seeds used for the analysis were freshly dehulled and dehulled and then stored at room temperature in open air conditions for four months. The freshly dehulled sunflower seeds had a PV of 4.14 meq O2/Kg fat, similar values with those reported in the literature. The sunflower seeds dehulled and than stored for 4 months at room temperature in open air conditions had a PV of 89.47 meq O2/Kg fat, rancid taste being detected. Regarding the oxidative stability of sunflower halva, care must be taken on storage conditions and packaging – temperature and oxygen availability. For further studies addition of supplementary antioxidants should be considered.

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